Предмет: Геометрия, автор: HULK1337

найдите площадь параллелограмма если две его стороны равны 7 см и 5см а угол между ними равен 30 градусам

Ответы

Автор ответа: ksenya200782

ABCD-параллелограм, AB=CD =7, AD=BC=5, BK-высота из В на AD, треугольник ABK: угол AKB=90 град, угол A=30 град, sin A= BK/AB, BK=sin30xAB= 0,5x7=3,5 S(ABCD)= ADxBK=5x3,5=17,5 см^2

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2. Of all the devices which man has invented to carry him from here to there, swiftly and effortlessly....

3. One of the earliest self-propelled cars was built ….

4. Although these early steam engines operated from a fixed position,........

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